Whats most important to know about ordering these is that selecting a different color selects a different style and therefore a totally different garment. The red union suit has buttons and a slit in the back, is made with heavyweight cotton, and has close fitting cuffs and ankles. The black union suits are made of lightweight, waffle type cotton and polyester, (like the older style two piece thermal underwear), have snap button closures, do not fit snugly around the cuffs or ankles like the red style, and in the back have a separation of the union suit with an elastic band that allows you to tuck in the upper piece. More on this below.
The red, heavier weight cotton version I find to be extremely comfortable, very warm in cold weather, and overall more comfortable than the black style. The ankle and cuff closure are thick and elastic and make putting on clothes less aggravating as they hold the sleeves and legs from riding up as you are getting dressed.They are more suited for colder weather than the black style and DO have a flap in the back for those who would use it. They wick moisture away and I find them to be the most comfortable of the two styles.
The black style is more suited for milder cold weather. I like the snap style buttons better on these but thats where it ends. As one reviewer stated about the buttons on the other style, they sometimes are not the right size and need to either be replaced or have someone sew up the button hole as they come unbuttoned. But most annoying of the black style is the rear separation of the upper and lower with the elastic band. (Look at the pictures provided by Amazon) It is like it is a one piece in the front and a two piece in the back. Plus it is impossible to use the bathroom without taking them off on the top and that makes them inconvenient. I find that if it is anything below freezing they are too lightweight and if it is above 50 F they feel uncomfortable as they don’t wick moisture away as easily.
Carhartt is known for durable, long lasting clothing and the red style is in line with their usual quality. I bought the red style first and love them. I mistakenly bought the black style thinking they were just like the red style and I never wear them unless it is mild or my red ones are dirty. I DO wish the red style had the snap closure, but beyond that I love them. Look at the pictures provided by Amazon carefully and you will see the difference in the two styles. It is misleading to most and I wasted my money on the black style.
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